beagled/Lucene.Net/Analysis/LowerCaseFilter.cs

   1 /*
   2  * Copyright 2004 The Apache Software Foundation
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 using System;
  17 namespace Lucene.Net.Analysis
  18 {
  19
  20         /// <summary> Normalizes token text to lower case.
  21         ///
  22         /// </summary>
  23         /// <version>  $Id: LowerCaseFilter.cs,v 1.2 2005/01/17 19:54:27 joeshaw Exp $
  24         /// </version>
  25         public sealed class LowerCaseFilter : TokenFilter
  26         {
  27                 public LowerCaseFilter(TokenStream in_Renamed) : base(in_Renamed)
  28                 {
  29                 }
  30
  31                 public override Token Next()
  32                 {
  33                         Token t = input.Next();
  34
  35                         if (t == null)
  36                                 return null;
  37
  38                         t.termText = t.termText.ToLower();
  39
  40                         return t;
  41                 }
  42         }
  43 }